<template>

<el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
      <div>
          <img src="../assets/logo.jpg" alt="" style="width:60px; height:60px" >
          <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
  </el-header>
    <!-- 页面主体区域 -->
  <el-container>
      <!-- 侧边栏 -->
    <el-aside width="isCollapse ? '24px' : '200px'"> 
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
    <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409eff" :unique-opened="true" 
      :collapse="isCollapse" :collapse-transition="false" 
      router
      :default-active="activePath">
       <!-- 一级菜单 -->
      <el-submenu :index="item.id + ''" v-for="item in meunlist" :key="item.id">
           <!-- 一级菜单模板区 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
       <el-menu-item :index="'/'+  subItem.path + ''" v-for="subItem in item.children" 
       :key="subItem.id" @click="saveNavState('/'+  subItem.path)">
           <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
       </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
      <!-- 右侧内容布局 -->
    <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
    data () {
        return {
            // 左侧菜单数据
            meunlist:[],
            iconObj: {
                '125': 'el-icon-s-custom',
                '103': 'el-icon-s-cooperation',
                '101': 'el-icon-s-shop',
                '102': 'el-icon-s-claim',
                '145': 'el-icon-s-data'
            },
            // 是否折叠
             isCollapse: false,
            //  被激活的链接地址
            activePath: ''
        }
       
    },
//部件
 components: {
 },
//静态
 props: {
 },
//对象内部的属性监听，也叫深度监听
 watch: {
 },
//属性的结果会被缓存，除非依赖的响应式属性变化才会重新计算。主要当作属性来使用；
 computed: { 
 },
//方法表示一个具体的操作，主要书写业务逻辑；
 methods: { 
     logout(){
         window.sessionStorage.clear();
         this.$router.push('/login');
     },
    //  获取所有的菜单
    async getMenuList(){
        const{data : res} = await this.$http.get('menus');
        if (res.meta.status != 200) {
            return this.$,message.console.error(res.meta.msg);
        }else{
            return this.meunlist = res.data;
        }
        console.log(res);
     },
    //  点击按钮， 切换菜单的折叠与展开
     toggleCollapse() {
            this.isCollapse = !this.isCollapse;
     },
    //  保存链接的激活状态
    saveNavState(activePath) {
        window.sessionStorage.setItem('activePath', activePath);
        this.activePath = activePath;
    }
 },
//请求数据
 created() {
     this.getMenuList();
     this.activePath = window.sessionStorage.getItem('activePath');
},
 mounted() {
}
}
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0%;
    align-items: center;
    color: #ffffff;
    font-size: 20px;
    > div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}
.el-main{
    background-color: #eaedf1;
}
.toggle-button {
    background-color: #4a5064;
    font-size: 13px;
    line-height: 24px;
    color:#fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
